三种尾矿砂颗粒物对Pb(Ⅱ)和Cd(Ⅱ)的吸附行为

THE ADSORPTION OF Pb(Ⅱ) and Cd(Ⅱ) BY THREE KINDS OF ORE TAILING PARTICLES

为了解尾矿砂类型与废矿水污染河流中重金属离子的化学平衡关系，以及ｐＨ值对尾矿颗粒物吸附特征的影响，研究了铅锌矿、锑矿及黄铁矿等３种尾矿颗粒物对重金属离子Ｐｂ（Ⅱ）和Ｃｄ（Ⅱ）的吸附行为，测定了其吸附等温线、动力学过程和ｐＨ值吸附突跃曲线．结果表明：３种尾矿颗粒物对重金属离子Ｐｂ（Ⅱ）和Ｃｄ（Ⅱ）有较强的吸附作用，吸附等温线属Ｌａｎｇｍｕｉｒ型，吸附速度快，在１０ｍｉｎ内趋于平衡，在一定ｐＨ范围内，吸附量随ｐＨ值升高而增加．

This paper aims at finding out the chemical equilibrium relation between ore tailing′s type and heavy metal ions in rivers polluted by metal ore mining. Also,the pH′s effect on ore tailing particles′ adsorptive capacity is studied. An experiment is conducted to study the particles of lead zinc,antimony and pyrite,and their adsorption of the heavy metal ion Pb(Ⅱ) and Cd(Ⅱ). The adsorption isotherm,kintics and pH adsorption edges of Pb(Ⅱ) and Cd(Ⅱ) are measured,too. The results show that these three types of ore tailing particles can adsorb Pb(Ⅱ) and Cd(Ⅱ) fairly well. The adsorption isotherm is the Langmuir type,and adsorptive speed is rather fast,the equilibrium completes within 10 min. In a specific pH range,the pH rises with the increase of the adsorbed amount.